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Typical Application Fields
| Application Field | Specific Scenarios | Key Requirements |
| Chemical / Petrochemical | Reactor, distillation column, heat exchanger flanges | Corrosion resistance, high temperature, creep resistance |
| Semiconductor / Photovoltaic | High-purity gas/chemical delivery pipelines | Ultra-high purity, low outgassing, non-contaminating |
| Food & Pharmaceutical | Fermentation tanks, filling lines, CIP systems | FDA certified, non-toxic, easy to clean |
| Energy & Power | Nuclear/high-temperature steam lines in power plants | High temperature/pressure resistance, radiation resistance |
| Aerospace | Fuel systems, hydraulic systems, engines | Wide temperature range, media resistance, long life |
| Automotive Manufacturing | Fuel cells, new energy battery packs | Coolant resistance, reliable sealing |
Technological Frontiers
1. Multifunctional Composite Technology
Conductive ePTFE Gaskets: Added carbon nanotubes, surface resistivity 10²-10⁶ Ω, for static dissipation.
Thermally Conductive ePTFE Gaskets: Filled with boron nitride/alumina, thermal conductivity >1.5 W/m·K.
Flame-Retardant ePTFE Gaskets: Special formulations achieving UL94 V-0 rating.
2. Structural Innovation & Design
Graded-Density Structure: Dense surface layer for permeation resistance, soft inner layer for high resilience.
Corrugated/Serrated Structure: Increases localized contact pressure, optimizing sealing performance.
Pre-compressed Forming: Pre-compressed ex-factory, achieving optimal seal immediately upon installation.
3. Smart Sealing Technology
Sensor-Integrated Gaskets: Embedded fiber optic sensors for real-time monitoring of seal status and temperature.
Self-Healing Gaskets: Microcapsule technology that releases sealant upon micro-leakage.
Gasket Types & Structures
| Gasket Type | Structural Features | Applicable Conditions | Sealing Mechanism |
| Standard Flat Gasket | Cut from uniform ePTFE sheet | General static seals, pressure <10 MPa | Compression-Recovery Seal |
| Inner Ring Gasket | ePTFE + 304/316L inner ring | High pressure, blow-out prevention, gasket protection | Inner Ring Positioning + Compression Seal |
| Clad Gasket | ePTFE envelope over graphite/ceramic fiber core | High temperature/pressure, anti-extrusion | Core Pressure Bearing + ePTFE Seal |
| Serrated/Corrugated Gasket | Embossed or serrated surface | Uneven flange surfaces | Line Contact, High Specific Pressure |
| Spiral Wound Gasket | Wound ePTFE filler strip + metal strip | High temperature/pressure, thermal cycling | Metal Skeleton Pressure Bearing + ePTFE Seal |
| O-Ring Cross-Section | ePTFE cord formed into O-ring shape | Groove seals, replacing rubber O-rings | Compression-Recovery, No Cold Flow |
| Custom-Shaped Gaskets | CNC cut / molded | Complex flange faces, non-standard equipment | Precise Fit to Sealing Surface |
Key Performance Parameters Table
| Performance Indicator | Standard ePTFE Gasket | Reinforced ePTFE Gasket | Test Standard |
| Density (g/cm³) | 0.4 – 0.8 | 0.6 – 1.2 | ASTM D792 |
| Tensile Strength (MPa) | MD: 10-25 / TD: 5-15 | MD: 15-40 / TD: 10-25 | ASTM D638 |
| Elongation at Break (%) | 50 – 200 | 30 – 100 | ASTM D638 |
| Compressibility (%) | 15 – 30 | 10 – 25 | ASTM F36 |
| Recovery (%) | 40 – 60 | 30 – 50 | ASTM F36 |
| Creep Relaxation (%) | <5 (24h, RT) | <3 (24h, RT) | ASTM F38 |
| Leak Rate (mbar·L/s) | <10⁻⁴ (Nitrogen) | <10⁻⁵ (Nitrogen) | EN 13555 |
| Thermal Conductivity (W/m·K) | 0.05 – 0.10 | 0.10 – 0.25 | ASTM E1530 |
Chemical Resistance Table
| Chemical Medium | Concentration | Max. Temp. (°C) | ePTFE Compatibility | Recommended Gasket Type |
| Hydrofluoric Acid | ≤50% | 100 | Excellent | Standard or Reinforced |
| Concentrated Sulfuric Acid | 98% | 200 | Excellent | Standard |
| Nitric Acid | 68% | 150 | Excellent | Standard |
| Sodium Hydroxide | 50% | 100 | Excellent | Standard |
| Aqua Regia | Concentrated | 100 | Excellent (short-term) | Reinforced |
| Acetone | Acetone | 60 | Excellent | Standard |
| Benzene | 100% | 100 | Excellent | Standard |
| Liquid Oxygen/Nitrogen | - | -196 | Excellent | Low-Temperature Specialized |
| Saturated Steam | - | 315 | Excellent | High-Temp Reinforced |
Application Selection Guide
| Application Scenario | Recommended Type | Key Parameters | Expected Service Life |
| Strong Acid Piping (Chemical) | Standard ePTFE Flat Gasket | Acid resistance, Thickness 2mm | 5 – 8 years |
| High-Temp Steam Systems | Graphite-Filled Reinforced Gasket | 315°C resistance, Creep resistance | 8 – 10 years |
| Semiconductor High-Purity Gas | Ultra-High Purity ePTFE Gasket | Metal ions <10 ppb, Laser cut | 10+ years |
| Food/Pharma Tank Vessels | FDA Certified White Gasket | Non-toxic, Easy clean, CIP/SIP resistant | 5 – 7 years |
| Cryogenic Liquid Nitrogen Piping | Low-Temp Specialized ePTFE Gasket | Maintains elasticity at -196°C | 10+ years |
| High-Pressure Reactors | ePTFE Clad or Spiral Wound Gasket | Pressure 25 MPa, Thermal cycling resistant | 3 – 5 years (varies) |
| Uneven Flange Faces | Thick Soft Gasket (3mm) | Compensation ability >0.5mm | Case-dependent |
| Frequent Disassembly Areas | ePTFE Gasket with Inner Ring | Blow-out prevention, Easy alignment, Reusable 2-3x | Reliable per installation |
